A study of Pt/ZrO2 catalysts for water-gas shift reaction in the presence of H2S

Sour water–gas shift reaction over Pt/CeZrO2 catalysts

“…A bond between H 2 S and Pt occurred, forming H 2 and PtS, which blocked platinum surface sites and could explain the deactivation observed in the presence of sulfur [18].…”

“…In the search for more advantageous catalysts for the WGSR, several studies with noble metal catalysts have been reported [9][10][11][12][13][14][15][16][17][18][19][20][21]. The use of noble metal catalysts is related to their capability of being stable in an oxidizing atmosphere.…”

“…Some authors noted a certain tolerance of platinum catalysts in the presence of sulfur, which has been explained by the low stability of sulfur-platinum bonds [18,20,24].…”

“…Xue et al [18] performed a comparative study of sulfur tolerance between commercial Cu-Zn, Co-Cr, and Fe-Cr catalysts and Pt/ZrO 2 . These catalysts were exposed to different H 2 S concentrations (50,200, and 1000 ppm).…”

“…As platinum catalysts were suitable for the WGSR, showing some tolerance and/or good recovery when exposed to sulfur [18,20,24,30,35] Then an excess of ammonium hydroxide (Carlo Erba) was added as a precipitation agent to co-precipitate ceria and zirconium hydroxides. The precipitate was washed with deionized water, dried at 120°C overnight, and calcined at 800°C (5°C/min) for 1 h.…”